Patent US 2010/0126053 A1 Ammunition magazine with four ammunition stacks
Patent 33089 Shell (1861)
Patent 1399243 Trench mortar (1921)
Patent 1471063 Trench mortar (1923)
Patent 1524273 Trench mortar and the like (1925)
Patent 1633710 Trench mortar and the like (1927)
Patent 3505924 Silent mortar (1970)
